Circular saw



FIG. 1 is a right elevation view of a circular saw showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left elevation thereof;

FIG. 4 is a rear elevation view thereof;

FIG.5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a circular saw, as shown and described. 